//使用两个线程来累加 count 的值
//每个线程循环 1w 次，累加变量 count 的值，count 默认值为 0，注意线程安全问题。

class Counter{
    private static int count = 0;
    public void add(){
        synchronized (this){
            count++;
        }
    }
    public int getCount(){
        return count;
    }
}
public class Homework1 {
    public static void main(String[] args) throws InterruptedException {
        Counter counter = new Counter();
        Thread t1 = new Thread(()->{
            for (int i = 0; i <10000 ; i++) {
                counter.add();
            }
        });
        Thread t2 = new Thread(()->{
            for (int i = 0; i <10000 ; i++) {
                counter.add();
            }
        });
        t1.start();
        t2.start();
        t1.join();
        t2.join();
        System.out.println("count = "+counter.getCount());
    }
}
